American mixed martial arts fighter Nate Diaz revealed under what condition he would agree to fight UFC welterweight prospect Khamzat Chimaev.
"If Chimaev can beat Usman, then maybe I'll accept the fight," Diaz tweeted.
Kamaru Usman made his fifth title defense at UFC 268 on October 7, defeating Colby Covington on points.
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Diaz had his last fight on June 12, losing by unanimous decision to Leon Edwards.